Improvement in machines for spirally sawing logs



. 2 Sheets-Sheet 1. V S. T. MOFFETT. Machine for Spiranllyw Sawing Logs.

No. 203,182. Patented April 30,1878.

UKQQQ M 2 Q I f ag N. PETERS. PHDTO-LITHOGRAPHER, WASHINGTON. 0. c

2 Sheets-Sheet 2.

s. T. MOFFETT. M aohine-for Spirall'y Sawing Logs.

No. 203,182 Patented April 30,

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N. PETERS. FHOTO-LITHOGRAPHEH, WASHINGTON. D. C.

teeth, 0 c, and hooked or clearing teeth d d,

ported by two rotary screws, 1 7*, that screw frame,

"UNITED STATES PATENT OFFIoE.

SEWALL T. MOFFETT, OF LISBON, HAMPSHIRE.

IMPROVEMENT IN MAC H INES FOR SPI'RALLY SA-WING LOGS.

Specification forming part of Letters Patent No. 203,182,

dated April 30, 1878; application filed April 4,1878.

To all whom it may concern: i zontal shaft, u, arranged in the carriage 13, in Be it known that I, SEWALL T. MOFFETT, manner asrepresented. Aspur-gear, c, fixed on of Lisbon, of the county of Grafton, of the State of New Hampshire, have invented a new and useful or Improved Machine for Spirally Sawing Logs; and do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of which-- Figure lis a top view, Fig. 2 a front elevation, Fig. 3 a longitudinal section, and Fig. 4 a transverse section.

In this machine the log to be cut is supported by mechanism, by which it is intermittingly raised and revolved, in order that the rotary cutter-wheel or saw may intermittingly saw through it, the log being at rest while being sawed.

In the drawings, the frame of the machine is shown at A. It is provided with two sets, a a b b, of parallel rails or waysfor supporting and guiding the saw-carriage. {Shown at B.) Arranged vertically in such carriage is a shaft, G, for supporting on its upper end the circular saw D, provided with a series of cuttingarranged as shown. This saw-carriage has mechanism for imparting to it reciprocating rectilinear movements, such machinery consisting of a connecting-rod, e, and a cranked wheel, f, the latter being applied to a driving shaft, 9, arranged as represented. A pulley, h, fixed on such shaft, carries an endless belt, t, that extends partly about a small pulley, k, fixed on a vertical shaft, 1, carrying a larger pulley, m, and being arranged in the frame in manner as shown.

An endless belt, n, goes about the wheel or pulley m and a pulley, n, fixed on the lower part of the saw-shaft, which derives its rotary motion from such pulleys h k m n and belts i and n. i

The log shown at E is sustained by and between two arbors, 0 1), arranged, as shown, in another carriage, F, placed in pairs of vertical guide-posts, q q q q. Thiscarriage is supinto a stationary bar, o arranged across the as shown. On the tops of these screws being to engage secured on a horibevel-gears s s are fixed, they connected by rods 0 d with other bevel-gears, t t,

the outer end of the shaft u, engages with another spur-gear, w, by means of an intermediate gear, v, the said gearw being fixed on the arbor 10. On the arbor w of the said intermediate gear is a ratchet-wheel, 1 that has resting on it a draw-pawl, z, pivoted to a long lever, a, that extends up through a link, b, with a spring, e, and a right-angular lever, f, all being arranged as represented.

By a rod, g, the lever f is connected with another such lever, h, which, in turn, by a rod, 2', is connected with a third such lever, is, arranged horizontally, and pivoted to the frame at about the middle of its front end.

A cam, m, formed as shown in top view in Fig. 5, and fixed to the saw-carriage, is to act against the lever k, which it does during an advance as well as during a retreat of the carriage. In moving against the lever the cam will turn such lever on its fulcrum, and thereby the draw-pawl will be advanced :in the ratchet-wheel. 0n the saw having passed through the log, the lever will have passed off the cam,and the draw-pawl will be retracted by the force of the spring 6. On the drawpawl being drawn back, itwill turn the ratchet, in consequence of which the screws 1* rwill be revolved so as to cause the log-carriage to be moved upward a short distance, it being at rest while the saw may be in movement through the log.

From the above it will be seen that after the saw may have passed through the log the latter will be forced upward a short distance, and at the same time revolved sufficiently for the saw to cut into it during the next movement of such saw.- Thus the log, by the successive movements of the saw through it, and by being intermittingly raised and revolved, will be cut in a spiral from its circumference to or about to its center, and thereby will be reduced to a long board, which may be used for various purposes in the arts.

I claim- 1. The saw and log carriages arranged in and applied to the frame as described, and provided with mechanism, substantially as set forth, for revolving and otherwise moving the saw and elevating and turning the 10g all as all being applied and arranged with the frame explained. and the saw and log-carriages, substantially 2. The combination for intermittingly elein manner and to operate as set forth. vating the lo -carria e and revolving the 10 such consistil ig 0f the screws 1" 1", bevel-geaji's SEWALL MOFFETT' s s t t, shaft u, spur-gears v v w, log-arbors 0 Witnesses: 1o,ratehet-Wheel y, draw-pawl z, lever to, spring R. H. EDDY,

0, series of bent levers f h 70, and the cam m, J OHN R. SNOW. 

